President Trump compared the size of his non-existent "nuclear button to Kim Jong Un's.

President Trump was not quite right on the button when trumpeting the U.S.’s nuclear superiority over North Korea.

Among the reactions to his Tuesday tweet saying that his “Nuclear Button” is “much bigger & more powerful” than Kim Jong Un’s were embarrassment, anger and fearful laughter, but also questions about how exactly a nuclear attack would be launched.

There in fact is no “Nuclear Button,” capitalized or otherwise, that would allow Trump to attack the isolated regime with the “fire and fury” he promised.

Trump, as other presidents have had, is in possession of a nuclear “biscuit” card that contains the launch codes that can be used with the nuclear “football” briefcase, carried by a military aide, to fire part of the arsenal.

The football, so named because of a nuclear plan called “dropkick,” does not contain a big red button either, but holds options potential targets such as Pyongyang and primarily serves to verify the president’s identity, according to Smithsonian.

Col. Buzz Patterson, who carried the device for Bill Clinton, famously said that the options are similar to a “Denny’s breakfast menu” where the president could choose from different columns.

Trump’s button brouhaha is also not the first time that officials have used as the metaphor for the president’s nuclear capability, with Hillary Clinton repeatedly asking whether Americans wanted her opponent’s finger near “the button.”

A group of former nuclear launch officers also used the term, though acknowledged it was “proverbial,” in an October 2016 open letter saying that Trump was unfit to hold responsibility for weapons that could quickly kill millions.

Indeed, Trump’s jab at the relative size of his and Kim’s button, which the North Korean leader referenced in a New Year's Day speech, most likely refers to the number of weapons in their respective arsenals.

The U.S. has an estimated 6,800 nuclear warheads compared to North Korea’s 10, according to the Arms Control Association.

Trump and Kim’s contest threatening carnage is believed to be part of the reason the Nobel Peace Prize was awarded last year to the International Campaign to Abolish Nuclear Weapons.